2181215099 has 4 divisors (see below), whose sum is σ = 2492817264. Its totient is φ = 1869612936.

The previous prime is 2181215093. The next prime is 2181215111. The reversal of 2181215099 is 9905121812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2181215099 - 2¹⁶ = 2181149563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2181215093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155801072 + ... + 155801085.

It is an arithmetic number, because the mean of its divisors is an integer number (623204316).

Almost surely, 2^2181215099 is an apocalyptic number.

2181215099 is a deficient number, since it is larger than the sum of its proper divisors (311602165).

2181215099 is an equidigital number, since it uses as much as digits as its factorization.

2181215099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311602164.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 2181215099 is about 46703.4805876393. The cubic root of 2181215099 is about 1296.8791210739.

The spelling of 2181215099 in words is "two billion, one hundred eighty-one million, two hundred fifteen thousand, ninety-nine".